You can upgrade instances of, SQL Server 2005, SQL Server 2008, or SQL Server 2008 R2 to SQL Server 2012. Before running SQL Server Setup to upgrade to SQL Server 2012, review the following topics about the upgrade process.
Documents supported upgrade paths to SQL Server 2012.
Describes Upgrade Advisor, a tool that analyzes instances of SQL Server 2005, SQL Server 2008, and SQL Server 2008 R2 to identify known upgrade issues.
Introduces the Distributed Replay Utility and describes how you can use it to prepare for an upgrade of SQL Server.
Provides links to procedural topics for upgrading to SQL Server 2012.